git-apply: skip threeway in add / rename cases
Certain invocations of "git apply --3way" will attempt threeway and
fail due to missing objects, even though git is able to fall back on
apply_fragments and apply the patch successfully with a return value
of 0. To fix, return early from try_threeway() in the following
cases:
- When the patch is a rename and no lines have changed. In this
case, "git diff" doesn't record the blob info, so 3way is neither
possible nor necessary.
- When the patch is an addition and there is no add/add conflict,
i.e. direct_to_threeway is false. In this case, threeway will
fail since the preimage is not in cache, but isn't necessary
anyway since there is no conflict.
This fixes a few unecessary error messages when applying these kinds
of patches with --3way.
It also fixes a reported issue where applying a concatenation of
several git produced patches will fail when those patches involve a
deletion followed by creation of the same file. Add a test for this
case too. (test provided by <i@zenithal.me>)
Signed-off-by: Jerry Zhang <jerry@skydio.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>